(Japanese: 眠りの氷穴Sleepy Ice Cave) is a playable dungeon the player goes through in Pokémon Mystery Dungeon: Gates to Infinity. It has 99 floors and no boss. This dungeon is accessible after completing the main story-line. The player's Pokémon's level is reset to level five for this dungeon. The player's Pokémon will lose HP as they walk if their belly is empty.